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A prefix is a word form that attaches to the beginning of another word or word root, that alters or specifies its meaning.

Examples of prefixes :

re- (to repeat or undo an action) : reconstitute, rerun, reenter

pre- (before) : preview, preregister, prediction

exo- (outside) : exoskeleton, exosphere

in/non/un- (negative, not, or undo) : inactivity, untie, non-perishable, nonfat

Metric system

The International System of Units (SI) specifies a set of unit prefixes known as SI prefixes or metric prefixes. These set the value of a unit in powers of 10.

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9y ago

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